* {
    margin: 0;
    padding: 0;
    list-style: none;
    box-sizing: border-box;
}

.header {
    width: 500px;
    margin: 50px auto;
}

.search {
    width: 260px;
    height: 36px;
}
ul ul {
    padding-left: 30px;
    display: none;
}

.sel-ul{
    display: none;
    height:500px;
    overflow: auto;
}
